http://www.sciencedirect.com/science/article/pii/S0016236119320022 CO flooding is an important method in CO enhanced oil recovery (EOR) but is usually accompanied by a low 2 2 efficiency for the fractured low-permeability formation due to CO low viscosity and high mobility. In this 2 paper, a comprehensive experimental research effort including flooding and NMR testing is conducted to investigate the oil recovery and mobility control effects of a novel CO oil-based foam in fractured low- 2 permeability cores. First, the foaming performance of the compound surfactant SF in crude oil that consists of Span20 and fluorochemical surfactant F-1 is evaluated by the blender stirring method. The surfactant SF exhibits a good foaming performance in crude oil with a foam volume of 290 mL and a half-life of 352 s. The bubble film is notably thickened, which results in a stable oil-based foam. Second, CO flooding and CO oil- 2 2 based foam flooding in nonfractured and fractured cores are conducted under reservoir conditions. CO oil- 2 based foam flooding can significantly improve the oil recovery and increase the sweep volume of injected CO . 2 Consequently, the oil recovery in fractured cores increases by 47.8%, and that in nonfractured cores increases by 39.1%. Third, the residual oil saturation in the cores is tested by NMR. The residual oil saturation of fractured and nonfractured cores after CO oil-based foam flooding is low and distributed evenly, indicating that 2 CO oil-based foam reduces CO mobility and yields a relatively uniform displacement throughout the core. 2 2

Li, Y., Lan, L., Wang, K., Yang, Y., 2019. Differences in lacustrine source rocks of Liushagang Formation in the Beibuwan Basin Acta Petrolei Sinica 40, 1451-1459.

http://www.syxb-cps.com.cn/EN/abstract/abstract5793.shtml The Beibuwan Basin is an important oil-rich basin in the offshore area of China. The oil and gas resources are 8 mainly distributed in Weixi'nan sag, Wushi sag and Fushan sag. The proved oil reserves are about 4.05×10 t, but the proved oil and gas reserves of each sag are significantly different. The enrichment degree of hydrocarbon in each sag of the Beibuwan Basin is closely related to the difference in lacustrine source rocks. From Weixi'nan sag to Wushi sag, Maichen sag and Fushan sag, the quality of source rocks in the Paleogene Liushagang Formation overall declines, the organic matter abundance of source rocks decreases, the dominant organic matter type changes from the sapropelic type to the mixed type, and the hydrocarbon generation potential of source rocks decreases. The analysis shows that although in the formation period of source rocks in Liushagang Formation, each sag in the Beibuwan Basin generally had high organic matter productivity in ancient lakes, there is still a certain difference in the organic matter sources of each sag, as well as the preservation conditions of organic matters. From Weixi'nan sag to Wushi sag, Maichen sag, Fushan sag and Haizhong sag, the organic matters from lacustrine algae are reduced, the organic matters from terrestrial higher plants are increased, and the preservation conditions of organic matters tend to be worse.

Li, Y., Pang, T., Shi, J., Deng, X., Kong, G., Lu, X., 2020. Conversion method for linear retention indices in gas n n chromatography acquired using -alkanes and -fatty acid methyl esters. Chinese Journal of Chromatography 38, 244-249.

Retention index (RI) is a powerful tool for gas chromatography-based structure elucidation of various n n compounds. In this study, linear RIs based on -alkanes and -fatty acid methyl esters in different temperature programs were fitted. Nearly identical first-order linearities were acquired with different temperature programs. 2 2 y x r y x r The linear equations were =1.0051 +318.51 ( =1) and =1.0362 +562.519 ( =1) for polar (packed with polyethylene glycol) and semi-standard non-polar (packed with 5% diphenyl/95% dimethylpolysiloxane) x y n columns, respectively. The variables and in the equations stand for RIs based on -fatty acid methyl esters n and -alkanes, respectively. The established linearity was then verified using the reference RIs collected in the NIST mass spectral library, Golm metabolite library, and Fiehnmetabolite library. The RI values converted using both the acquired equations finely matched those in the references. The established relationship between the two kinds of RIs can be used to expand the RI references and decrease the number of RI acquisition experiments.

Li, Y., Talalay, P.G., Sysoev, M.A., Zagorodnov, V.S., Li, X., Fan, X., 2020. Thermal heads for melt drilling to subglacial lakes: Design and testing. Astrobiology 20, 142-156.